The present invention relates to a substrate for a display device and, more particularly, to a substrate for a display device, which not only has excellent durability, but can also minimize the occurrence of color shift when applied to a display device. To this end, the present invention provides a substrate for a display device, which is characterized by including: a substrate; a hard coat film formed on the substrate and formed of AlON; and a multilayer film formed between the substrate and the hard coat film, and formed of a coating film having a first refractive index and a coating film having a second refractive index, which are repetitively stacked in sequence.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A substrate for a display device, comprising: a base substrate; a hard coat film disposed over the base substrate, the hard coat film being formed of AlON; and a multilayer film disposed between the base substrate and the hard coat film, wherein the multilayer film comprises at least one coating film having a first refractive index and at least one coating film having a second refractive index which are sequentially and repeatedly stacked on each other, wherein the first refractive index ranges from 2.0 to 2.5, and the second refractive index ranges from 1.35 to 1.6, wherein the multilayer film comprises: a first coating film disposed on the base substrate, the first coating film having the first refractive index; a second coating film disposed on the first coating film, the second coating film having the second refractive index; a third coating film disposed on the second coating film, the third coating film having the first refractive index; and a fourth coating film disposed on the third coating film, the fourth coating film having the second refractive index, wherein each of the first coating film and the third coating film have a thickness less than each of the second coating film and the fourth coating film, wherein a thickness of the hard coat film is at least 10 times a thickness of the multilayer film, and wherein a thickness of the first coating film is smallest and a thickness of the hard coat film is greatest among the first coating film, the third coating film, and the hard coat film.
2. The substrate according to claim 1 , wherein the at least one coating film having the first refractive index and the at least one coating film having the second refractive index are sequentially and repeatedly stacked on each other at least two times.
3. The substrate according to claim 1 , wherein the first and third coating films are formed of a metal oxide, the refractive index of which ranges from 2.0 to 2.5, the metal oxide being selected from the group consisting of Nb 2 O 5 , TiO 2 , Ta 2 O 5 , Ti 2 O 3 , Ti 3 O 5 and ZrO 2 .
4. The substrate according to claim 1 , wherein the thickness of the hard coat film ranges from 1,000 to 3,000 nm.
5. The substrate according to claim 1 , further comprising a fifth coating film disposed on the hard coat film, the fifth coating film being formed of a material, a refractive index of which is lower than a refractive index of the hard coat film.
6. The substrate according to claim 5 , wherein the material of the fifth coating film is identical to a material of the second coating film and the fourth coating film.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
September 3, 2015
September 3, 2019
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